Amplifier



BEST AVAILABLE comv Oct. 97,'1'923. -1,469,876

A. BENOIT ET AL.

AMPLIFIER Filed April 17 1922 Worf/ey Patented Oct. 9, 1923.

ANTONI-o BnNoIT, :Josnrn Lucian avrai-nieu) 'A itn n'ii'riiin'oitrarsnas nUoHEsNE, or MONTREAL, QUEBEC, cannnlrynssrenonsmo,BENOIT a'ma'rnrnu, or MONTREAL,

15a .f -i 1- Y CANADA.

T all whom t may concern:

Be it known that we, ANToNIo BENOIT, JOSEPH LUonzN MATHIEU, and HENRI HoRMIsDAs DUcHnsNE, all British subjects, residing at 195 St. Timothee Street, in the city of Montreal, in the Province of Quebec, in the Dominion of Canada, have invented certain new and useful Improvements in Amplifiers; and we do hereby declare that the following is a true, clear, and exact description of the same.

The present invention relates to improvements in amplifiers, and it consists in providing an amplifier built up of a plurality of superposed layers of compressed wood pulp, or of any other suitable material, having between them an intermediate layer of a different material, and preferably covered by a binding layer, such as fabric; the different layers being secured together by an adhesive to form a unitary mass.

rIhe invention herein claimed is a division of that originally disclosed in our prior application, No. 463,715, filed April 22, 1921.

The main object of the invention is to provide an amplifier built of such materials and in such a manner, that its sides will have a certain amount of resiliency, which will practically eliminate the squeaking soundof the needle on the disk and absorb the superfluous vibrations.

The invention will be better understood with the aid of the following description and accompanying drawings, in Which:

Figure 1 is a side vertical sectional view of the amplifier applied to a talking machine,

Figure 2 is an enlarged cross section of a portion of the amplier illustrating the different layers forming part thereof.

Referring to the drawings 1 is the talking machine casing or cabinet, and 2 is the usual hinged cover. A partition r 3 is provided in the upper portion of the cabinet on which are mounted the tone arm l and the turn table 5, the former bearing the reproducer, and 6 is the usual motor which is secured below said partition 8 and which actuates the turn table.

Below said partition 3 is provided the amplifier 7, one end of which projects ::'ei.' .'-;j;A f 463.715. Divided and this application filed April 17,

Serial No. 554,126.

through the opening 8 in said partition 3, and fits snugly into the bearing 9 of the tone arm il. A flange 1() is provided on said amplifier which rests against the under side of said partition 3 and by means of which the amplifier may be rigidly secured. The amplifier is preferably curved at 11 to avoid Contact with the motor 6.

In constructing the amplifier, a core of suitable shape is used, and preferably a heavy or thick sheet of suitable material, such as paper 1d, is placed around said core. It is covered with a'coating of a suitable adhesive, over which is placed a thinner layer 15, of paper or other suitable material. Another coating of adhesive is applied to said layer 15 over which is imposed two layers of preferably pressed pulp board 16, said layers 16 being separated by a thin layer 17 preferably of paper. Each layer 1G and 17 is covered with a coating of adhesive, the top layer 16 being preferably covered by a binding layer such as fabric.

The different layers of compressed wood pulp 16 are, previous to being placed on the core, rendered flexible by dipping them in a bath of water and then dried sufiiciently to be moulded the desired shape.

When the amplifier has dried, the core is removed by means of a suitable device.

Evidently, any other suitable fibrous material can be used instead of pulp board, without departing from the scope and spirit of the invention, as the main idea is to build an amplifier, the walls of which will have a suflicient amount of resiliency to absorb the surplus vibrations, the function being somewhat similar to the action of the muscles in a human throat.

lVhat we claim as our invention is:

1. A sound amplifier for talking machines, comprising an inner layer of paper; a pair of layers of fibrous material superposed thereon; an intermediate layer of material between the fibrous layers: and a binding layer of fabric encasing the outer fibrous layer; the various layers being secured together by adhesive material.

2. A sound amplifier for talking machines, comprising an inner layer of paper; a pair of relatively-thick layers of fibrous material superposed thereon; a relatively-thin layer of material between the fibrous layers; and a binding layer eneasing the outer fibrous layer; the various layers being secured together by adhesivematerial. -r

3. A sound amplifier for talking machines, comprising an inner layer of paper; apair of f relatively-thick layers of pulp board siiperposed thereon; a relatively-thin layer of paper between the pulp board layers; and a binding layer of fabric eneasing the outer pulp board layer; the various layers being secured together by adhesive material.

Signed at Montreal, Quebec, Canada, this 3rd day of April 1922.

ANTONIO BENOIT. JOSEPH LUCIEN MATHIEU. HENRI HORMISDAS DUCHESNE. Witnesses:

C. PATENAUDE,

T. BEAUDOIN. 

